CONOR McGregor is out to redeem his first and only UFC loss in his welterweight rematch against Nate Diaz at UFC 202 on August 20 (August 21, Manila time) in Las Vegas. And judging by the big bill from his training camp, he’s dead set on redemption regardless of the cost.

By his estimate, the Irish MMA star said he has spent $300,000 during preparations for the much-anticipated rematch. The flamboyant McGregor suffered the first ever loss of his UFC career in March via a second round submission at the hands of Diaz.

The 27-year old McGregor has undergone intense preparation in Dublin, Iceland and Las Vegas. Since July, he has been in relative isolation in the desert. His training camp is based in a $2.5 million, six-bedroom mansion.

"This is a big, big expense -- but what I make is big. So, in the bigger picture, it's rather small," said McGregor who will earn more than $1 million from undisclosed pay-per-view bonuses as well as the UFC purse.

Apart from head coach John Kavanagh and his assistants, McGregor has spared no expense, hiring a masseuse, a performance coach, a movement coach, a nutritionist and various sparring partners. Irish middleweight boxer Conor Wallace was brought in to simulate Diaz's striking style.

"This is most certainly not another fight," McGregor said. "I have done things differently this fight. We have been going to war every single day in the gym in preparation for this. So, this is a war to me."